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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 237 (Engine Mechanical - 3.9L) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Intake Manifold Cleaning and Inspection - Upper >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Identifying Throttle Body Bolts & Nuts
    GM1639213Courtesy of GENERAL MOTORS CORP.
  1. Remove the throttle body bolts and nuts.
  2. Remove the throttle body.
  3. Remove the throttle body studs, if required.
  4. Remove the manifold absolute pressure (MAP) sensor (1).
  5. Remove the evaporative emissions (EVAP) purge valve bolt (2).
  6. Remove the EVAP purge valve (3).
    7. Fig 2: Identifying EVAP Purge Valve Isolator
    GM1665698Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: If at any time the intake manifold tuning valve blade becomes separated from the actuator, DO NOT cycle the actuator. Cycling the actuator without the blade attached will offset the calibration and the entire intake manifold tuning valve assembly will need to be replaced.
  7. Remove the intake manifold tuning valve bolts.
  8. Remove the intake manifold tuning valve.
    9. CAUTION: Bodily injury may occur if the cleaning solvent is inhaled or exposed to the skin.
  9. Clean the intake manifold with solvent.
  10. Dry the intake manifold with compressed air.
  11. Inspect all gasket mating surfaces for nicks or cracks and replace if necessary.
    12. Fig 3: View Of Intake Manifold Tuning Valve
    GM1557831Courtesy of GENERAL MOTORS CORP.
  12. Inspect the intake manifold tuning valve seal for damage. Inspect the intake manifold tuning valve blade for cracks, missing material or looseness. The tuning valve blade attachment to the motor should be tight, with no slack present. Replace if necessary.
    13. Fig 4: View Of Tuning Valve Blade
    GM1580024Courtesy of GENERAL MOTORS CORP.
  13. Apply lubricant GM P/N 1051344 (Canadian P/N 993037) to the valve shaft (1).
    14. Fig 5: View Of Intake Manifold Tuning Valve
    GM1557831Courtesy of GENERAL MOTORS CORP.
  14. Install the intake manifold tuning valve, ensuring proper alignment is achieved. Failure to do so may result in the valve getting jammed or stuck in the intake manifold.
    15. NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
  15. Install the intake manifold tuning valve bolts.

    Tighten:  Tighten the intake manifold tuning valve bolts to 10 N.m (89 lb in).

    16. Fig 6: Identifying Throttle Body Bolts & Nuts
    GM1639213Courtesy of GENERAL MOTORS CORP.
  16. Inspect the EVAP purge valve seal for damage and replace if necessary.
  17. Install the EVAP purge valve (3).
  18. Install the EVAP purge valve bolt (2).

    Tighten:  Tighten the EVAP purge valve bolt to 16 N.m (12 lb ft).

  19. Inspect the MAP sensor seal for damage and replace if necessary.
  20. Install the MAP sensor (1).
  21. Install the throttle body studs, if required.

    Tighten:  Tighten the throttle body studs to 6 N.m (53 lb in).

  22. Inspect the throttle body seal for damage and replace if necessary.
  23. Install the throttle body.
  24. Apply threadlock GM P/N 12345382 (Canadian P/N 10953489) to the throttle body bolt and nut threads.
  25. Install the throttle body bolts and nuts.

    Tighten:  Tighten the throttle body bolts and nuts to 10 N.m (89 lb in).

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